/**
 * MIT License
 * 
 * Copyright (c) 2024 - present @ ebraid
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */


#include <stdint.h>
#include <string.h>
#include <types.h>


/**
 * @brief Move data from one segment of memory to another segment of memory
 * @param dst:  Destination memory address
 * @param src:  Source memory address
 * @param len:  Size of copied memory in bytes
 * @return none
*/
void * memmove(void * dst, const void * src, size_t len)
{
    if(dst < src || (char *)dst > ((char *)src + len)) {
        return memcpy(dst, src, len);
    }

    if(dst > src) {
        char * tmp = (char *)dst + len - 1;
        char * s   = (char *)src + len - 1;

        while(len--) {
            *tmp-- = *s--;
        }
    }
    else {
        char * tmp = (char *)dst;
        char * s   = (char *)src;

        while(len--) {
            *tmp++ = *s++;
        }
    }

    return dst;
}